How does the R22 MCP Limits graph work?
How does the R22 MCP Limits graph work?
Before taking off in the R22, one of the performance checks is to calculate limit of MCP and 5 Min Take Off power available from the graph in the aircraft.
As the OAT gets higher, and thus air less dense, more MAP is available. (And as pressure alt increases at a constant OAT less MAP is available). I have been told this is to do with the temperature of the burn of the fuel on ignition which could lead to overstressing the drive system and blades at lower temperatures.
Can someone give an informed explanation of whats happening inside the engine and why the graph reads like this please?